Abstract
During animal development, cells have to respond appropriately to localized secreted signals. Proper responses to Hedgehog, transforming growth factor-β, epidermal growth factor and fibroblast growth factor/Ras signals require cognate inducible antagonists such as Patched, Dad, Argos and Sprouty1. Wnt signals are crucial in development and neoplasia2. Here we show that naked cuticle (nkd), a Drosophila segment-polarity gene, encodes an inducible antagonist for the Wnt signal Wingless (Wg). In fly embryos and imaginal discs nkd transcription is induced by Wg. In embryos, decreased nkd function has an effect similar to excess Wg; at later stages such a decrease appears to have no effect. Conversely, overproduction of Nkd in Drosophila and misexpression of Nkd in the vertebrate Xenopus laevis result in phenotypes resembling those of loss of Wg/Wnt function. nkd encodes a protein with a single EF hand (a calcium-binding motif) that is most similar to the recoverin family of myristoyl switch proteins. Nkd may therefore link ion fluxes to the regulation of the potency, duration or distribution of Wnt signals. Signal-inducible feedback antagonists such as nkd may limit the effects of Wnt proteins in development and disease.
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Acknowledgements
We thank L. Mathies for identifying the P element in the nkd gene; D. Bilder, K. Cadigan, S. Carroll, C. Goodman, A. Hudson, N. Ito, C. Kirkpatrick, A. Martinez-Arias, R. Nusse, C. Nüsslein-Volhard, G. Panganaban, N. Patel, M. Peifer, N. Perrimon, G. Rubin and A. Spradling for mutants, reagents and advice; J. Axelrod, L. Luo, R. Nusse and R. Rousset for comments on the manuscript; S. Blair, S. Conley, S. DiNardo, A. Martinez-Arias, S. Sokol and M. Deardorff for providing information before publication; M. Fish for injection of UAS–Nkd constructs; and K. Cadigan and D. Bilder for stained material. W.Z. and J.M. were supported by postdoctoral training grants from the NIH and by the Howard Hughes Medical Institute (HHMI). K.A.W. was supported by an HHMI postdoctoral fellowship for physicians and a NIH K-08 Award. P.K. and M.P.S. are Investigators of the HHMI.
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Zeng, W., Wharton, K., Mack, J. et al. naked cuticle encodes an inducible antagonist of Wnt signalling . Nature 403, 789–795 (2000). https://doi.org/10.1038/35001615
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DOI: https://doi.org/10.1038/35001615
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